Related Clues:

• Twitch irregularly — or regularly — with this
• Bit of a jerk
• Involuntary jerk, e.g
• Little bit of personality
• Sort of movement some solicitor set up
• With 50 and 55 Across, the ''central'' theme
• Wrinkling one's nose, perhaps
• What the odd letters in "twitch" spell
• Syllable before 'Tac' or '-tac-toe'
• Started serving customers
• Little jerk not quite recalling quote
• First of three game X's
• Idiosyncratic twitch
• Began to write in dictionary
• Check mark*